Clara Josephine Zetkin, née Eißner (born July 5, 1857 in Wiederau, Amtshauptmannschaft Rochlitz, Kingdom of Saxony; † June 20, 1933 in Arkhangelskoje, Moscow Oblast, Soviet Union) was a socialist-communist German politician, peace activist and women's rights activist. She was active in the SPD until 1917 and a prominent representative of the revolutionary-Marxist faction in this party. In 1917 she joined the SPD spin-off USPD. There she belonged to the left wing or to the Spartacus group, which was renamed the Spartakusbund during the November Revolution in 1918. This in turn merged with other left-wing revolutionary groups in the newly founded Communist Party of Germany (KPD) at the turn of the year 1918/1919. As an influential member of the KPD, Zetkin was a member of the Reichstag from 1920 to 1933 and, in 1932, President of Parliament.
At the supranational level, Zetkin was one of the founders of the Second International of the socialist labor movement as a participant in the International Workers' Congress of 1889 in Paris. In her work for the International, she is considered to be the formative initiator of International Women's Day. As a member of the headquarters or of the executive committee of the KPD, later known as the Central Committee, she was a member of the Executive Committee of the Communist International (EKKI) from 1921 to 1933, where in the last years of her life she belonged to the minority of critics of the social fascism thesis ultimately prescribed by Stalin.
Source: Wikipedia